Update loading_bar.js

[ipostol]

add more settings to props

[ipostol]

please add props for customize loading-bar speed etc..

[coveralls]

Coverage remained the same at 100.0% when pulling d9e120e on ipostol:patch-2 into af3ec66 on mironov:master.

[mironov]

@ipostol Good idea!
Please add a spec for the change and I'll merge it.

[coveralls]

Coverage remained the same at 100.0% when pulling 0dc0b41 on ipostol:patch-2 into af3ec66 on mironov:master.

[ipostol]

Sorry for many build fails, It was too lazy to clone repository :)

[coveralls]

Coverage remained the same at 100.0% when pulling b20d3a4 on ipostol:patch-2 into af3ec66 on mironov:master.

[mironov]

@ipostol Hey, I've incorporated your changes in 0c3dc25 along with additional tests.
Thanks for the pull request!